Mateus 18

15 But if thy brother should sin against thee, go and reprove him between thee and him alone. If he should hear thee, thou have gained thy brother.

16 But if he should not hear, take with thee one or two besides, so that at the mouth of two or three witnesses every word may be established.

17 And if he is heedless of them, speak to the church. But if he is also heedless of the church, let him be to thee as the heathen and the tax collector.